blob: a794a8ca8b4fd86e1b501448eab60a2a5a99e1bb [file] [log] [blame]
Herbert Xud2acc342006-03-28 01:12:13 -08001/* tunnel4.c: Generic IP tunnel transformer.
2 *
3 * Copyright (C) 2003 David S. Miller (davem@redhat.com)
4 */
5
6#include <linux/init.h>
7#include <linux/module.h>
8#include <linux/mutex.h>
9#include <linux/netdevice.h>
10#include <linux/skbuff.h>
Herbert Xu50fba2a2006-04-04 13:50:45 -070011#include <net/icmp.h>
12#include <net/ip.h>
Herbert Xud2acc342006-03-28 01:12:13 -080013#include <net/protocol.h>
14#include <net/xfrm.h>
15
16static struct xfrm_tunnel *tunnel4_handlers;
Kazunori MIYAZAWAc0d56402007-02-13 12:54:47 -080017static struct xfrm_tunnel *tunnel64_handlers;
Herbert Xud2acc342006-03-28 01:12:13 -080018static DEFINE_MUTEX(tunnel4_mutex);
19
Kazunori MIYAZAWAc0d56402007-02-13 12:54:47 -080020int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family)
Herbert Xud2acc342006-03-28 01:12:13 -080021{
22 struct xfrm_tunnel **pprev;
23 int ret = -EEXIST;
24 int priority = handler->priority;
25
26 mutex_lock(&tunnel4_mutex);
27
Kazunori MIYAZAWAc0d56402007-02-13 12:54:47 -080028 for (pprev = (family == AF_INET) ? &tunnel4_handlers : &tunnel64_handlers;
29 *pprev; pprev = &(*pprev)->next) {
Herbert Xud2acc342006-03-28 01:12:13 -080030 if ((*pprev)->priority > priority)
31 break;
32 if ((*pprev)->priority == priority)
33 goto err;
34 }
35
36 handler->next = *pprev;
37 *pprev = handler;
38
39 ret = 0;
40
41err:
42 mutex_unlock(&tunnel4_mutex);
43
44 return ret;
45}
46
47EXPORT_SYMBOL(xfrm4_tunnel_register);
48
Kazunori MIYAZAWAc0d56402007-02-13 12:54:47 -080049int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family)
Herbert Xud2acc342006-03-28 01:12:13 -080050{
51 struct xfrm_tunnel **pprev;
52 int ret = -ENOENT;
53
54 mutex_lock(&tunnel4_mutex);
55
Kazunori MIYAZAWAc0d56402007-02-13 12:54:47 -080056 for (pprev = (family == AF_INET) ? &tunnel4_handlers : &tunnel64_handlers;
57 *pprev; pprev = &(*pprev)->next) {
Herbert Xud2acc342006-03-28 01:12:13 -080058 if (*pprev == handler) {
59 *pprev = handler->next;
60 ret = 0;
61 break;
62 }
63 }
64
65 mutex_unlock(&tunnel4_mutex);
66
67 synchronize_net();
68
69 return ret;
70}
71
72EXPORT_SYMBOL(xfrm4_tunnel_deregister);
73
74static int tunnel4_rcv(struct sk_buff *skb)
75{
76 struct xfrm_tunnel *handler;
77
Herbert Xu50fba2a2006-04-04 13:50:45 -070078 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
79 goto drop;
80
Herbert Xud2acc342006-03-28 01:12:13 -080081 for (handler = tunnel4_handlers; handler; handler = handler->next)
82 if (!handler->handler(skb))
83 return 0;
84
Herbert Xu50fba2a2006-04-04 13:50:45 -070085 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0);
86
87drop:
Herbert Xud2acc342006-03-28 01:12:13 -080088 kfree_skb(skb);
89 return 0;
90}
91
Kazunori MIYAZAWAc0d56402007-02-13 12:54:47 -080092#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
93static int tunnel64_rcv(struct sk_buff *skb)
94{
95 struct xfrm_tunnel *handler;
96
97 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
98 goto drop;
99
100 for (handler = tunnel64_handlers; handler; handler = handler->next)
101 if (!handler->handler(skb))
102 return 0;
103
104 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0);
105
106drop:
107 kfree_skb(skb);
108 return 0;
109}
110#endif
111
Herbert Xud2acc342006-03-28 01:12:13 -0800112static void tunnel4_err(struct sk_buff *skb, u32 info)
113{
114 struct xfrm_tunnel *handler;
115
116 for (handler = tunnel4_handlers; handler; handler = handler->next)
117 if (!handler->err_handler(skb, info))
118 break;
119}
120
121static struct net_protocol tunnel4_protocol = {
122 .handler = tunnel4_rcv,
123 .err_handler = tunnel4_err,
124 .no_policy = 1,
125};
126
Kazunori MIYAZAWAc0d56402007-02-13 12:54:47 -0800127#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
128static struct net_protocol tunnel64_protocol = {
129 .handler = tunnel64_rcv,
130 .err_handler = tunnel4_err,
131 .no_policy = 1,
132};
133#endif
134
Herbert Xud2acc342006-03-28 01:12:13 -0800135static int __init tunnel4_init(void)
136{
137 if (inet_add_protocol(&tunnel4_protocol, IPPROTO_IPIP)) {
138 printk(KERN_ERR "tunnel4 init: can't add protocol\n");
139 return -EAGAIN;
140 }
Kazunori MIYAZAWAc0d56402007-02-13 12:54:47 -0800141#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
142 if (inet_add_protocol(&tunnel64_protocol, IPPROTO_IPV6)) {
143 printk(KERN_ERR "tunnel64 init: can't add protocol\n");
144 inet_del_protocol(&tunnel4_protocol, IPPROTO_IPIP);
145 return -EAGAIN;
146 }
147#endif
Herbert Xud2acc342006-03-28 01:12:13 -0800148 return 0;
149}
150
151static void __exit tunnel4_fini(void)
152{
Kazunori MIYAZAWAc0d56402007-02-13 12:54:47 -0800153#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
154 if (inet_del_protocol(&tunnel64_protocol, IPPROTO_IPV6))
155 printk(KERN_ERR "tunnel64 close: can't remove protocol\n");
156#endif
Herbert Xud2acc342006-03-28 01:12:13 -0800157 if (inet_del_protocol(&tunnel4_protocol, IPPROTO_IPIP))
158 printk(KERN_ERR "tunnel4 close: can't remove protocol\n");
159}
160
161module_init(tunnel4_init);
162module_exit(tunnel4_fini);
163MODULE_LICENSE("GPL");